Improvements to the internal and external antenna H(-) ion sources at the Spallation Neutron Source.
Rev Sci Instrum
; 85(2): 02B135, 2014 Feb.
Article
em En
| MEDLINE
| ID: mdl-24593575
ABSTRACT
The Spallation Neutron Source (SNS), a large scale neutron production facility, routinely operates with 30-40 mA peak current in the linac. Recent measurements have shown that our RF-driven internal antenna, Cs-enhanced, multi-cusp ion sources injects â¼55 mA of H(-) beam current (â¼1 ms, 60 Hz) at 65-kV into a Radio Frequency Quadrupole (RFQ) accelerator through a closely coupled electrostatic Low-Energy Beam Transport system. Over the last several years a decrease in RFQ transmission and issues with internal antennas has stimulated source development at the SNS both for the internal and external antenna ion sources. This report discusses progress in improving internal antenna reliability, H(-) yield improvements which resulted from modifications to the outlet aperture assembly (applicable to both internal and external antenna sources) and studies made of the long standing problem of beam persistence with the external antenna source. The current status of the external antenna ion source will also be presented.
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MEDLINE
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En
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Rev Sci Instrum
Ano de publicação:
2014
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Article